Steam-boiler



(No Model.)

W. PLAGG.

STEAM BOILEB.. No. 325,332. Patented Sept. 1, 1885.

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wrTNEssEs UNITED STATES Partnr irren.

VILLTAM FLAGG, OF BROOKLYN,- NEV YORK.

STEAM-BOILER.

EPECIFCATION forming part of Letters Patent No. 325,332, dated September l, 1885.

(No model.)

To all whom. t may concern:

ating steam with a minimum amount of fuel.

My invention consists in a novel organization of parts, and in certain combinations of devices, to be particularly pointed out by the claims, after being first described by the aid of the accompanying drawings, which show its application to a marine boiler.

Figure l is a front elevation, and Fig. 2 a View, partly in vertical longitudinal central section and partly in side elevation, representing all those parts of the boiler illustration of which is required to convey a proper understanding of a suitable adaptation of my improveniente.

rThe boiler shell or casing A has double ends or heads B C. As shown, the front head, B, is formed of inner and outer plates, I) D', and the rear head of inner and outer plates, c c', the plates of the respective heads being suitably bolted together. The water-spaces a d, thus provided between the pla-tes of the double heads, extend uninterruptedly from side to side, or entirely across the boiler, and may be divided by separatingpartitions into any desired number of smaller spaces ofthe full width of the boiler to control the course of the water and insure its proper circulation, as soon to be described.

A large number of small water-circulating boiler-tubes, D, of, say,an inch or less in diameter, (shown as arranged in parallel rows in a heating-chamber, Il) communicate at their opposite ends with the front and rear waterspaces, and the flames and heated products of combustion pass from the fire-box F, along by way of this boilertube heating-chamber E, between and in Contact with the boiler-tubes, the waste products of combustion finding outlet by way of the smoke-stack G.

As in this instance shown, the water-space d of the rear head of thc boiler is undivided, and the water-space of the opposite head is separated by a partition, a', into upper and lower parts, the lower portion being of less vertical area than the upper, and communicating with the front ends of the three lowermostrows of boilertubes. As before stated, the waterspaces (both the front and the rear spaces) may be separated into any desired suitable number of parts by partitions extending across the spaces, and it is not necessary that the relative sizes of the upper and lower portions ot' the waterspaee a be such as shown.

A steam chamber or donie,.H, from which the steam passes by an outlet-pipe, .71.,as usual, is connected by means of an inletpipe, l, with the boiler. This boiler-connecting pipe I enters the steam-dome at or near its top, and this pipe at its lower end connects with the upper end of the front water-space or head of the boiler. A deflecting-plate, t', secured at its upper edge to the inner top surface of the steanidome, projects downwardly a sufiicient distance to direct the incoming water toward the bottom of the steam-dome. This deileetor terminates at its lower end above the waterlevel, is inclined, (see Fig. 2,) and serves, as will further on be made apparent, to prevent the water as it enters forcibly into the steamdome from commingling with the dry steam, which accumulates in the upper part of the steamdorne. The steam entering from the inlet-pipe to the dome iinds its way beneath the deflector to the upper part or steamspace of the domein obvious way.:

Near the lower end of the steam-dome a water-circulating pipe, K, communicates with it. The lower end of this return-pipe coinmunicates with a feed-water tank or drum, L. The feed-water is supplied to this drum as needed by a pipe, Z, in well-known way.

A water-circulating pipe, M, makes communicating connection between the feed-water drum and the boiler. As in this instance shown, this water-circulating pipe M connects at one end with one end of the feed-water drum near its top, and at its opposite end or upright portion, m, this pipe communicates with the lower portion of the front waterspace, c, of the boiler. 'The uprightpipe m enters this water-space near the bottoni thereof.

IOO

A suitable pump, N, operated in appropriate well-known way, servesy to keep up a forced circulation of water through the boiler.

From the above description it will be seen that when the pump is in operation water will be forced from the feed-water drum into the front water-space of the boiler, through the lower boiler-tubes to the back water-space, thence through the water-tubes above the partition a', and by way of the front and back water-spaces and the circulating-pipe I into the steam-dome, to the bottom of which the hot water passes, and thence by way of return water-circulating pipe K back to the feed-water drum, and warming the water therein preparatory to its being forced through the boiler, as the circulation is continuously kept up. It will be seen that as the feedwater is heated and a very large heating-surface provided the steam is rapidly generated with but slight consumption of fuel, the boiler-tubes being of such small diameter that the water within them is very rapidly heated.

In order that the boiler may be kept in operation for short periods, as occasion may require,.without using the pump to keep up a forced circulation of the water, an auxiliary communicating-pipe, O, is provided to direct the water from the feed-water drum to the upright portion m of the pipe, which makes Vcommunication between the feed-water drum and the boiler-front. The auxiliary communicating-pipe O is provided with valves o I). Vhen the regular operation of the boiler is going on-that is, when the pump is in opertion-the valves o l? are closed, and when the pump is out of operation and the pipe O in use the valve o is open. Valves g are provided in the communicating pipe M, and these valves are of course open when the pump is at work. They are closed should the pump get out of order, or when the pump is out of action and the auxiliary communicating-pipe is being employed. ."Ihe auxiliary communicating-pipe serves as a blow-oft' pipe, and when so used both of its valves are of course open.

A short pipe, R, provided with a valve, 1', connects the pipe I with the lower part of the dome H. Ordinarily the valve r is closed 5 but when the pump is not in act-ion this valve is opened and facilitates the operation of the boiler when a natural circulation is going on.

Although I have described but one organization of my improvements, I do not Wish to be understood as confining my invention in all respects to the details of construction and arrangement specifically described, as, obviously, my invention may be modified in such ways as to adapt it for use in connection with boilers differing. somewhat from that particularly described herein.

I claim as of my own inventionl. The combination of the feed-water drum, the front and rear water-spaces of the boiler, the boiler-tubes, means by which the boiler has communicating connection with the feedwater drum, the steam-dome, the water-circulating pipe having inlet communication with it and communicating with the boiler, and the return-watercirculating pipe communicating with the steam-dome and feed-water drum, substantially as and for the purpose set forth.

2. The combination of the boiler-tubes, the inner and outer plates constituting-the front water-space extending from side to side of the boiler, the partition c', and the inner and outer plates constituting the rear water-space, likewise extending from side to side of the boiler, substantially as and for the purpose set forth.

3. The combination of the boiler, the steamdorne, the water-circulating pipe by which the water ascends from the boiler to the steamdome, the return-water-circulating pipe, the feedwater drum communicating with the steam-dome by way of the return-water-circulating pipe, means by which the Water is conducted from the feed-water drum to the boiler, and the pump by which a forced circulation of the water through the boiler and water-circulating pipes is kept up, substantially as and for the purpose set forth.

4. The combination of the boiler, the steamdome, its deflector projecting downwardly and terminating above the water-level, and the pipe I, connecting the steam dome and boiler and from which the Water issues against the deflector, substantially as and for the purpose set forth.

5. The combination ofthe feed-water drum, the boiler, the pipe M m, having communication with the boiler and feed-water drum, the pump, the pipe O, the valves of the pipes M and O, the steam-dome, the water-circulating pipe I, and the return-water-circulating pipe, substantially as and for the purpose set forth.

In testimony whereof I have hereunto subscribed my name.

VILLIAM FLAGG.

A Vitnesses:

BENJ. A. MORRISON, BENEDICT MARTELLA. 

